Microstructure effects for Casimir forces in chiral metamaterials

TitleMicrostructure effects for Casimir forces in chiral metamaterials
Publication TypeJournal Article
Year of Publication2010
AuthorsMcCauley AP, Zhao RK, Reid MTH, Rodriguez AW, Zhou JF, Rosa FSS, Joannopoulos JD, Dalvit DAR, Soukoulis CM, Johnson SG
Journal TitlePhysical Review B
Volume82
Pages165108
Date Published10/06
ISBN Number1098-0121
Accession NumberISI:000282569500001
Abstract

We examine a recent prediction for the chirality dependence of the Casimir force in chiral metamaterials by numerical computation of the forces between the exact microstructures, rather than homogeneous approximations. Although repulsion in the metamaterial regime is rigorously impossible, it is unknown whether a reduction in the attractive force can be achieved through suitable material engineering. We compute the exact force for a chiral bent-cross pattern, as well as forces for an idealized "omega"-particle medium in the dilute approximation and identify the effects of structural inhomogeneity (i.e., proximity forces and anisotropy). We find that these microstructure effects dominate the force for separations where chirality was predicted to have a strong influence. At separations where the homogeneous approximation is valid, in even the most ideal circumstances the effects of chirality are less than 10(-4) of the total force, making them virtually undetectable in experiments.

URL<Go to ISI>://000282569500001http://prb.aps.org/pdf/PRB/v82/i16/e165108
DOI10.1103/Physrevb.82.165108
Alternate JournalPhys Rev B